Rename ARM_CAx_No_GIC ARM_CA5_No_GIC and add FreeRTOSConfig setting to specify the number of registers in the FPU unit.

FreeRTOS/Source/portable/IAR/ARM_CA5_No_GIC/portASM.h

@@ -80,7 +80,9 @@ portSAVE_CONTEXT macro
 	; Save the floating point context, if any
 	FMRXNE  R1,  FPSCR
 	VPUSHNE {D0-D15}
+#if configFPU_D32 == 1
 	VPUSHNE	{D16-D31}
+#endif ; configFPU_D32
 	PUSHNE	{R1}
 
 	; Save ulPortTaskHasFPUContext itself
@@ -114,7 +116,9 @@ portRESTORE_CONTEXT macro
 
 	; Restore the floating point context, if any
 	POPNE 	{R0}
+#if configFPU_D32 == 1
 	VPOPNE	{D16-D31}
+#endif ; configFPU_D32
 	VPOPNE	{D0-D15}
 	VMSRNE  FPSCR, R0