Remove string concatenation in assembler files

Clang assembler doesn't support concatenation of adjacent strings.

Change-Id: I092a1e30c137d431c6adcc13519fc2d595f92f14
Signed-off-by: Roberto Vargas <roberto.vargas@arm.com>

include/plat/arm/common/aarch64/arm_macros.S

@@ -22,8 +22,7 @@ icc_regs:
 
 /* Registers common to both GICv2 and GICv3 */
 gicd_pend_reg:
-	.asciz "gicd_ispendr regs (Offsets 0x200 - 0x278)\n"	\
-		" Offset:\t\t\tvalue\n"
+	.asciz "gicd_ispendr regs (Offsets 0x200 - 0x278)\n Offset:\t\t\tvalue\n"
 newline:
 	.asciz "\n"
 spacer: