fix(arm): string split into two lines causing error

Fix the code related error message when user provides RESET_TO_BL31=1 to
the make command but fails to provide "ARM_PRELOADED_DTB_BASE" macro at
the same command line. Remove the line break from the error string
causing the code error.

Additionally, make doesn't parse quote marks in strings, thus remove
quote marks within error strings in this file.

Change-Id: Ic131b6febebfb420ed588fe4fb0853cbdae0afb8
Signed-off-by: Salman Nabi <salman.nabi@arm.com>

plat/arm/common/arm_common.mk

@@ -26,7 +26,7 @@ ifeq (${ARCH}, aarch64)
   else ifeq (${ARM_TSP_RAM_LOCATION}, dram)
     ARM_TSP_RAM_LOCATION_ID = ARM_DRAM_ID
   else
-    $(error "Unsupported ARM_TSP_RAM_LOCATION value")
+    $(error Unsupported ARM_TSP_RAM_LOCATION value)
   endif
 
   # Process flags
@@ -83,7 +83,7 @@ $(eval $(call add_define,ARM_BL31_IN_DRAM))
 # memory. This means we must not run BL31 from TZC-protected DRAM.
 ifeq (${ARM_BL31_IN_DRAM},1)
   ifeq (${ENABLE_RME},1)
-    $(error "BL31 must not run from DRAM on RME-systems. Please set ARM_BL31_IN_DRAM to 0")
+    $(error BL31 must not run from DRAM on RME-systems. Please set ARM_BL31_IN_DRAM to 0)
   endif
 endif
 
@@ -105,16 +105,15 @@ $(eval $(call add_define,ARM_LINUX_KERNEL_AS_BL33))
 ifeq (${ARM_LINUX_KERNEL_AS_BL33},1)
   ifneq (${ARCH},aarch64)
     ifneq (${RESET_TO_SP_MIN},1)
-      $(error "ARM_LINUX_KERNEL_AS_BL33 is only available if RESET_TO_SP_MIN=1.")
+      $(error ARM_LINUX_KERNEL_AS_BL33 is only available if RESET_TO_SP_MIN=1.)
     endif
   endif
   ifndef PRELOADED_BL33_BASE
-    $(error "PRELOADED_BL33_BASE must be set if ARM_LINUX_KERNEL_AS_BL33 is used.")
+    $(error PRELOADED_BL33_BASE must be set if ARM_LINUX_KERNEL_AS_BL33 is used.)
   endif
   ifeq (${RESET_TO_BL31},1)
     ifndef ARM_PRELOADED_DTB_BASE
-      $(error "ARM_PRELOADED_DTB_BASE must be set if ARM_LINUX_KERNEL_AS_BL33 is
-       used with RESET_TO_BL31.")
+      $(error ARM_PRELOADED_DTB_BASE must be set if ARM_LINUX_KERNEL_AS_BL33 is used with RESET_TO_BL31.)
     endif
     $(eval $(call add_define,ARM_PRELOADED_DTB_BASE))
   endif
@@ -456,6 +455,6 @@ endif
 
 ifeq (${RECLAIM_INIT_CODE}, 1)
     ifeq (${ARM_XLAT_TABLES_LIB_V1}, 1)
-        $(error "To reclaim init code xlat tables v2 must be used")
+        $(error To reclaim init code xlat tables v2 must be used)
     endif
 endif