Move CRP out of startup and into CRP.c so it can be conditionally compiled

Author: chrissnow

targets/TARGET_NXP/TARGET_LPC176X/device/CRP.c

@@ -0,0 +1,18 @@
+/* mbed Microcontroller Library
+ * Copyright (c) 2017 ARM Limited
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *	 http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+#if !defined(MBED_APP_START) // do not include CRP if there is a bootloader.
+    long CRP_Key __attribute__((section(".ARM.__at_0x000002FC "))) = 0xFFFFFFFF;
+#endif

targets/TARGET_NXP/TARGET_LPC176X/device/TOOLCHAIN_ARM_STD/startup_LPC17xx.S

@@ -82,12 +82,6 @@ __Vectors       DCD     __initial_sp              ; Top of Stack
                 DCD     PLL1_IRQHandler           ; 48: PLL1 Lock (USB PLL)
 
 
-                IF      :LNOT::DEF:NO_CRP
-                AREA    |.ARM.__at_0x02FC|, CODE, READONLY
-CRP_Key         DCD     0xFFFFFFFF
-                ENDIF
-
-
                 AREA    |.text|, CODE, READONLY