arch/arm/armv7: Don't set gcc specific options for clang builds

Clang doesn't understand the -Wa,-mno-warn-deprecated option.
Remove it for now.

Signed-off-by: Martin Roth <gaumless@gmail.com>
Change-Id: I9f91d6ec2db247e901ba9bc41bc4b888bbe43236
Reviewed-on: https://review.coreboot.org/c/coreboot/+/69672
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Arthur Heymans <arthur@aheymans.xyz>
Reviewed-by: Felix Held <felix-coreboot@felixheld.de>
Reviewed-by: Matt DeVillier <matt.devillier@amd.corp-partner.google.com>
diff --git a/src/arch/arm/armv7/Makefile.inc b/src/arch/arm/armv7/Makefile.inc
index 66ddc98..5675a26 100644
--- a/src/arch/arm/armv7/Makefile.inc
+++ b/src/arch/arm/armv7/Makefile.inc
@@ -5,7 +5,10 @@
 armv7-m_flags = -march=armv7-m $(armv7_flags) -D__COREBOOT_ARM_V7_M__
 armv7-r_flags = -march=armv7-r $(armv7_flags) -D__COREBOOT_ARM_V7_R__
 
-armv7_asm_flags = -Wa,-mthumb -Wa,-mimplicit-it=always -Wa,-mno-warn-deprecated
+armv7_asm_flags = -Wa,-mthumb -Wa,-mimplicit-it=always
+ifeq ($(CONFIG_COMPILER_GCC),y)
+armv7_asm_flags += -Wa,-mno-warn-deprecated
+endif
 armv7-r_asm_flags = $(armv7-r_flags) $(armv7_asm_flags)
 
 ###############################################################################