[MIPS] Yosemite: Fix warnings in i2c-yoesmite by deleting the unused code.

arch/mips/pmc-sierra/yosemite/i2c-yosemite.c: In function 'titan_i2c_xfer':
arch/mips/pmc-sierra/yosemite/i2c-yosemite.c:98: warning: 'data' may be used uninitialized in this function

Signed-off-by: Ralf Baechle <ralf@linux-mips.org>