ARM: 6286/1: fix Thumb-2 decompressor broken by "Auto calculate ZRELADDR"

"ARM: Auto calculate ZRELADDR and provide option for exceptions" broke
the Thumb-2 decompressor because it removed an entry in the LC0 table
but didn't adjust the offset the Thumb-2 code uses to load the SP from
that table.

Fix it, and also change the ARM code to use the separate SP-load since
ARM instructions that include the SP in the LDM register list are
deprecated.
Acked-by: NUwe Kleine-König <u.kleine-koenig@pengutronix.de>
Signed-off-by: NRabin Vincent <rabin@rab.in>
Signed-off-by: NRussell King <rmk+kernel@arm.linux.org.uk>

arch/arm/boot/compressed/head.S

@@ -170,9 +170,8 @@ not_angel:
 
 		.text
 		adr	r0, LC0
- ARM(		ldmia	r0, {r1, r2, r3, r5, r6, r11, ip, sp})
- THUMB(		ldmia	r0, {r1, r2, r3, r5, r6, r11, ip}	)
- THUMB(		ldr	sp, [r0, #32]				)
+		ldmia	r0, {r1, r2, r3, r5, r6, r11, ip}
+		ldr	sp, [r0, #28]
 #ifdef CONFIG_AUTO_ZRELADDR
 		@ determine final kernel image address
 		and	r4, pc, #0xf8000000