LOCAL / misc: bcm2835-smi: use proper convert function for __be32 pointer

LOCAL / misc: bcm2835-smi: use proper convert function for __be32 pointer

The of_get_address() returns __be32 pointer type, but it is
converted with __be32_to_cpu(). Use proper convert function
__be32_to_cpup() for the pointer.

This fixes following build warning:
   drivers/misc/bcm2835_smi.c: In function 'bcm2835_smi_probe':
   drivers/misc/bcm2835_smi.c:882:65: warning: cast from pointer to integer of different size [-Wpointer-to-int-cast]
     inst->smi_regs_busaddr = be32_to_cpu(addr);
                                                                    ^

Change-Id: I4230be2777eb02845bfaccf46e59d43ce0d90139
Fixes: 0f1ee9dcc3b3 ("MISC: bcm2835: smi: use clock manager and fix reload issues")
Signed-off-by: Seung-Woo Kim <sw0312.kim@samsung.com>