hikey: fix build issue for clang

plat/hisilicon/hikey/include/plat_macros.S:19:55: error: unexpected token in '.asciz' directive
 .asciz "gicd_ispendr regs (Offsets 0x200 - 0x278)\n" " Offset:\t\t\tvalue\n"
                                                      ^
Makefile:720: recipe for target 'build/hikey/debug/bl1/cortex_a53.o' failed
make: *** [build/hikey/debug/bl1/cortex_a53.o] Error 1

Merge two lines into one line.

Signed-off-by: Haojian Zhuang <haojian.zhuang@linaro.org>
diff --git a/plat/hisilicon/hikey/include/plat_macros.S b/plat/hisilicon/hikey/include/plat_macros.S
index 1ad217a..203d526 100644
--- a/plat/hisilicon/hikey/include/plat_macros.S
+++ b/plat/hisilicon/hikey/include/plat_macros.S
@@ -16,8 +16,7 @@
 gicc_regs:
 	.asciz "gicc_hppir", "gicc_ahppir", "gicc_ctlr", ""
 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: