mm/memblock: fix buld of "cris" arch

mm/memblock: fix buld of "cris" arch

The build of "criss" arch is broken after applying new memblock API
series.

In file included from arch/cris/mm/init.c:13:0:
include/linux/bootmem.h: In function 'memblock_virt_alloc':
include/linux/bootmem.h:229:55: error: 'KSEG_C' undeclared (first use in this function)
include/linux/bootmem.h:229:55: note: each undeclared identifier is reported only once for each function it appears in
include/linux/bootmem.h: In function 'memblock_virt_alloc_nopanic':
include/linux/bootmem.h:237:63: error: 'KSEG_C' undeclared (first use in this function)
include/linux/bootmem.h: In function 'memblock_virt_alloc_node':
include/linux/bootmem.h:250:27: error: 'KSEG_C' undeclared (first use in this function)
include/linux/bootmem.h: In function 'memblock_virt_alloc_node_nopanic':
include/linux/bootmem.h:258:28: error: 'KSEG_C' undeclared (first use in this function)

In file included from mm/bootmem.c:14:0:
include/linux/bootmem.h: In function 'memblock_virt_alloc':
include/linux/bootmem.h:229:55: error: 'KSEG_C' undeclared (first use in this function)
include/linux/bootmem.h:229:55: note: each undeclared identifier is reported only once for each function it appears in
include/linux/bootmem.h: In function 'memblock_virt_alloc_nopanic':
include/linux/bootmem.h:237:63: error: 'KSEG_C' undeclared (first use in this function)
include/linux/bootmem.h: In function 'memblock_virt_alloc_node':
include/linux/bootmem.h:250:27: error: 'KSEG_C' undeclared (first use in this function)

The "cris" arch defines memory parameters in a different manner than other
arch's and they are splitted between 2 headers: <asm/page.h> and <asm/mmu.h>

As result, now build is failed if "bootmem.h" included before
<asm/page.h> and <asm/mmu.h>. Hence, fix it by including additional
header in bootmem.h.

Signed-off-by: Grygorii Strashko <grygorii.strashko@ti.com>
Signed-off-by: Santosh Shilimkar <santosh.shilimkar@ti.com>
Cc: Yinghai Lu <yinghai@kernel.org>
Cc: Tejun Heo <tj@kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>