cnss2: Update board data file name for certain RF chip ID

If higher 4 bits of chip ID (device major version) is 1, read board
data file name as bdwlang.e<board ID>. The assumption is board ID
will be always less than 0xFF. If board ID (0xFF) is invalid in OTP
then read it as bdwlang.elf for such case. Also only use lower 4 bits
of device major version as the version number to load firmware file
because of above new requirement.

Change-Id: I4dce528a9c389a660b19dabe4ee44e655a23570b
Signed-off-by: Yue Ma <yuem@codeaurora.org>