arm64/sysreg: Guard SYS_FIELD_ macros for asm

The SYS_FIELD_ macros are not safe for assembly contexts, move them inside
the guarded section.
Signed-off-by: NMark Brown <broonie@kernel.org>
Link: https://lore.kernel.org/r/20220818213613.733091-3-broonie@kernel.orgSigned-off-by: NWill Deacon <will@kernel.org>

arch/arm64/include/asm/sysreg.h

@@ -1210,8 +1210,6 @@
 	par;								\
 })
 
-#endif
-
 #define SYS_FIELD_GET(reg, field, val)		\
 		 FIELD_GET(reg##_##field##_MASK, val)
 
@@ -1221,4 +1219,6 @@
 #define SYS_FIELD_PREP_ENUM(reg, field, val)		\
 		 FIELD_PREP(reg##_##field##_MASK, reg##_##field##_##val)
 
+#endif
+
 #endif	/* __ASM_SYSREG_H */