ARM: brcmstb: Enable ARCH_HAS_HOLES_MEMORYMODEL

Due to the brcmstb SoC's memory map, we may have holes in the memory if
we don't populate the maximum amount of memory supported by e.g: the
first memory controller which spans either the first 1GiB or first 2GiB
of memory.

We need to select ARCH_HAS_HOLES_MEMORYMODEL in order to enable
CONFIG_HAVE_ARCH_PFN_VALID on platforms that have CONFIG_SPARSEMEM
enabled.

Signed-off-by: Danesh Petigara <[e-mail]>
[florian: Detailed commit message]
Signed-off-by: Florian Fainelli <[e-mail]>

arch/arm/mach-bcm/Kconfig

···
 	select HAVE_ARM_ARCH_TIMER
 	select BRCMSTB_L2_IRQ
 	select BCM7120_L2_IRQ
+	select ARCH_HAS_HOLES_MEMORYMODEL
 	select ARCH_DMA_ADDR_T_64BIT if ARM_LPAE
 	select ZONE_DMA if ARM_LPAE
 	select SOC_BRCMSTB