Remove NVIC, SCB from the 1176

The 1176 imxrt-ral modules no longer provide an API for the NVIC or SCB.
It's the same process as b1fee46, but applied to the 1176 modules. I
re-introduced core interrupts by attaching them to the miscellaneous
control module (MCM). All separate GPC peripheral blocks are logically
within a single 'GPC' space, so selecting the standby sub-module was an
arbitrary decision.

Notice that this commit marks the GPU2D interrupt as reserved. This is
intentional; the SVDs do not describe a GPU2D peripheral, so imxrt-ral
doesn't have a corresponding module. This interrupt probably
piggy-packed on the NVIC. We can re-introduce that interrupt when we
describe the GPU2D peripheral.

CHANGELOG.md

@@ -2,6 +2,13 @@
 
 ## [Unreleased]
 
+**BREAKING** Remove the NVIC and SCB peripherals from the 1176. If you need an
+API for Cortex-M registers, check out the
+[`cortex-m`][https://crates.io/crates/cortex-m] crate.
+
+**BREAKING** The 1176 GPU2D interrupt is marked as reserved, and it's not
+available in the `Interrupt` enum.
+
 **BREAKING** In the 1176 API, there is only one SAI module. All SAI instances,
 including those that only have a single channel, now appear to support multiple
 channels. The user is responsible for making sure their SAI instance can

devices/imxrt1176_cm4.yaml

@@ -49,6 +49,10 @@ _delete:
   - USB_OTG2
   - USBNC_OTG2
 
+  # Do you need these? Check out the cortex-m crate (v0.7).
+  - NVIC
+  - SystemControl
+
 _modify:
   _peripherals:
     CM7_GPIO2:
@@ -193,3 +197,17 @@ PWM?:
         bitOffset: 2
         bitWidth: 1
         access: read-write
+
+MCM:
+  _add:
+    _interrupts:
+      CORE:
+        description: CORE
+        value: 19
+
+GPC_STBY_CTRL:
+  _add:
+    _interrupts:
+      GPC:
+        description: GPC
+        value: 117

devices/imxrt1176_cm7.yaml

@@ -10,6 +10,10 @@ _delete:
   - USB_OTG2
   - USBNC_OTG2
 
+  # Do you need these? Check out the cortex-m crate (v0.7).
+  - NVIC
+  - SystemControl
+
 _include:
   - "common_patches/dma0/tcd_cluster.yaml"
   - "common_patches/usb1.yaml"
@@ -133,3 +137,23 @@ PWM?:
         bitOffset: 2
         bitWidth: 1
         access: read-write
+
+CM7_MCM:
+  _add:
+    _interrupts:
+      CTI_TRIGGER_OUT0:
+        description: CTI_TRIGGER_OUT0
+        value: 17
+      CTI_TRIGGER_OUT1:
+        description: CTI_TRIGGER_OUT1
+        value: 18
+      CORE:
+        description: CORE
+        value: 19
+
+GPC_STBY_CTRL:
+  _add:
+    _interrupts:
+      GPC:
+        description: GPC
+        value: 117