[ARM] 4558/1: pxa: remove MACH_TYPE_LUBBOCK assignment and leave it to boot loader

since both u-boot and blob support passing MACH_TYPE_LUBBOCK to the
kernel, it should be quite safe to remove this
Signed-off-by: Neric miao <eric.y.miao@gmail.com>
Acked-by: NNicolas Pitre <nico@cam.org>
Signed-off-by: NRussell King <rmk+kernel@arm.linux.org.uk>

arch/arm/boot/compressed/head-xscale.S

@@ -33,10 +33,6 @@ __XScale_start:
 		bic	r0, r0, #0x1000		@ clear Icache
 		mcr	p15, 0, r0, c1, c0, 0
 
-#ifdef CONFIG_ARCH_LUBBOCK
-		mov	r7, #MACH_TYPE_LUBBOCK
-#endif
-
 #ifdef CONFIG_ARCH_COTULLA_IDP
 		mov	r7, #MACH_TYPE_COTULLA_IDP
 #endif