fix(arm): arm_rotpk_header undefined reference

Moving ARM_ROTPK_S to default to arm_dev_rotpk.S as it was not being
set for Juno cryptocell and this should be the value in most cases.

Change-Id: I56a5a4e61f1ca728b87322b0b09a0d73ed1d5ee0
Signed-off-by: Lauren Wehrmeister <lauren.wehrmeister@arm.com>
diff --git a/plat/arm/board/common/board_common.mk b/plat/arm/board/common/board_common.mk
index 1f59a4f..d73c2e3 100644
--- a/plat/arm/board/common/board_common.mk
+++ b/plat/arm/board/common/board_common.mk
@@ -12,6 +12,7 @@
 BL2_SOURCES		+=	drivers/cfi/v2m/v2m_flash.c
 
 ifneq (${TRUSTED_BOARD_BOOT},0)
+ARM_ROTPK_S = plat/arm/board/common/rotpk/arm_dev_rotpk.S
 ifneq (${ARM_CRYPTOCELL_INTEG}, 1)
 # ROTPK hash location
 ifeq (${ARM_ROTPK_LOCATION}, regs)
@@ -20,7 +21,6 @@
 	CRYPTO_ALG=rsa
 	ARM_ROTPK_LOCATION_ID = ARM_ROTPK_DEVEL_RSA_ID
 	ARM_ROTPK_HASH = plat/arm/board/common/rotpk/arm_rotpk_rsa_sha256.bin
-	ARM_ROTPK_S = plat/arm/board/common/rotpk/arm_dev_rotpk.S
 $(eval $(call add_define_val,ARM_ROTPK_HASH,'"$(ARM_ROTPK_HASH)"'))
 $(BUILD_PLAT)/bl2/arm_dev_rotpk.o : $(ARM_ROTPK_HASH)
 $(warning Development keys support for FVP is deprecated. Use `regs` \
@@ -29,7 +29,6 @@
 	CRYPTO_ALG=ec
 	ARM_ROTPK_LOCATION_ID = ARM_ROTPK_DEVEL_ECDSA_ID
 	ARM_ROTPK_HASH = plat/arm/board/common/rotpk/arm_rotpk_ecdsa_sha256.bin
-	ARM_ROTPK_S = plat/arm/board/common/rotpk/arm_dev_rotpk.S
 $(eval $(call add_define_val,ARM_ROTPK_HASH,'"$(ARM_ROTPK_HASH)"'))
 $(BUILD_PLAT)/bl2/arm_dev_rotpk.o : $(ARM_ROTPK_HASH)
 $(warning Development keys support for FVP is deprecated. Use `regs` \