Fix the following sparse warnings from a missing __iomem
in __bcm_kona_smc() function by adding __iomem attriubte.

arch/arm/mach-bcm/bcm_kona_smc.c:143:21: warning: incorrect type in initializer (different address spaces)
arch/arm/mach-bcm/bcm_kona_smc.c:143:21:    expected unsigned int [usertype] *args
arch/arm/mach-bcm/bcm_kona_smc.c:143:21:    got void [noderef] <asn:2> *static [toplevel] [assigned] bcm_smc
_buffer
arch/arm/mach-bcm/bcm_kona_smc.c:149:9: warning: incorrect type in argument 2 (different address spaces)
arch/arm/mach-bcm/bcm_kona_smc.c:149:9:    expected void volatile [noderef] <asn:2> *addr
arch/arm/mach-bcm/bcm_kona_smc.c:149:9:    got unsigned int [usertype] *
arch/arm/mach-bcm/bcm_kona_smc.c:150:9: warning: incorrect type in argument 2 (different address spaces)
arch/arm/mach-bcm/bcm_kona_smc.c:150:9:    expected void volatile [noderef] <asn:2> *addr
arch/arm/mach-bcm/bcm_kona_smc.c:150:9:    got unsigned int [usertype] *
arch/arm/mach-bcm/bcm_kona_smc.c:151:9: warning: incorrect type in argument 2 (different address spaces)
arch/arm/mach-bcm/bcm_kona_smc.c:151:9:    expected void volatile [noderef] <asn:2> *addr
arch/arm/mach-bcm/bcm_kona_smc.c:151:9:    got unsigned int [usertype] *
arch/arm/mach-bcm/bcm_kona_smc.c:152:9: warning: incorrect type in argument 2 (different address spaces)
arch/arm/mach-bcm/bcm_kona_smc.c:152:9:    expected void volatile [noderef] <asn:2> *addr
arch/arm/mach-bcm/bcm_kona_smc.c:152:9:    got unsigned int [usertype] *[assigned] args
Signed-off-by: Ben Dooks <ben.dooks@codethink.co.uk>
Acked-by: Scott Branden <scott.branden@broadcom.com>
Signed-off-by: Florian Fainelli <f.fainelli@gmail.com>