cpu/allwinner/a10: Add definition for gating GPIO S clock

This bit is not documented in the datasheet, but is used in the
upcoming RAM init code.

Change-Id: I697ec222496236ac7690460ee62313ab8b1a2f0b
Signed-off-by: Alexandru Gagniuc <mr.nuke.me@gmail.com>
Reviewed-on: http://review.coreboot.org/4592
Tested-by: build bot (Jenkins)
Reviewed-by: Paul Menzel <paulepanter@users.sourceforge.net>
Reviewed-by: David Hendricks <dhendrix@chromium.org>

src/cpu/allwinner/a10/clock.h

@@ -85,6 +85,8 @@ enum a1x_clken {
 	A1X_CLKEN_SPI2,
 	A1X_CLKEN_SPI3,
 	A1X_CLKEN_PATA,
+	RSVD_0x60_25,
+	A1X_CLKEN_GPS,
 	/* AHB1 module clock gating */
 	A1X_CLKEN_DRAM_VE = (0x64 << 5),
 	A1X_CLKEN_TVD,