ARM: shmobile: Remove mach/uncompress.h

Convert ARCH_SHMOBILE_LEGACY to make use of <debug/uncompress.h>
and remove the now unused <mach/uncompress.h>.

Signed-off-by: Magnus Damm <damm+renesas@opensource.se>
Acked-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Acked-by: Geert Uytterhoeven <geert+renesas@glider.be>
Signed-off-by: Simon Horman <horms+renesas@verge.net.au>