platform: msm_shared: Load a large image from MMC

CMD23_SET_BLOCK_COUNT command can set a number of blocks up to 0xffff.
When the block size is 512 bytes, each command can load up to 0x01fffe00.
mmc_read() now can handle a read request over this limit.

Change-Id: Ib832ed29bb1ec03a20071fa6fad72f4d8e4b4399
1 file changed