msm: camera: sensor: Validate i2c_frq_mode in msm_cci_get_clk_rates

i2c_freq_mode in msm_cci_get_clk_rates is populated from userspace.
Validate to make sure it has valid values. If a large number is sent
from userspace to avoid a buffer over read.

Crs-Fixed: 1086833
Change-Id: I237f60dca3e3dbad4e6188bf047cf7ec5163d159
Signed-off-by: Rajesh Bondugula <rajeshb@codeaurora.org>