Make y-cable check case insensitive

Set cxl bit when product name is y-cable(case insensitive)

Tested:
[----------] 7 tests from FormatIPMIFRUTest
[ RUN      ] FormatIPMIFRUTest.EmptyFruReturnsError
[       OK ] FormatIPMIFRUTest.EmptyFruReturnsError (0 ms)
[ RUN      ] FormatIPMIFRUTest.YCableProductNameSetsCxlDeviceCapCase
[       OK ] FormatIPMIFRUTest.YCableProductNameSetsCxlDeviceCapCase (0 ms)
[ RUN      ] FormatIPMIFRUTest.YCableProductNameSetsCxlDeviceSmallCase
[       OK ] FormatIPMIFRUTest.YCableProductNameSetsCxlDeviceSmallCase (0 ms)
[ RUN      ] FormatIPMIFRUTest.YCableProductNameSetsCxlDeviceCamelCase
[       OK ] FormatIPMIFRUTest.YCableProductNameSetsCxlDeviceCamelCase (0 ms)
[ RUN      ] FormatIPMIFRUTest.NormalProductNameDoesNotSetCxlDevice
[       OK ] FormatIPMIFRUTest.NormalProductNameDoesNotSetCxlDevice (0 ms)
[ RUN      ] FormatIPMIFRUTest.InvalidChecksumReturnsWarning
[       OK ] FormatIPMIFRUTest.InvalidChecksumReturnsWarning (0 ms)
[ RUN      ] FormatIPMIFRUTest.TruncatedFruReturnsError
[       OK ] FormatIPMIFRUTest.TruncatedFruReturnsError (0 ms)
[----------] 7 tests from FormatIPMIFRUTest (0 ms total)

Google-Bug-Id: 427566786
Change-Id: I03c8b01529d278a01a19a8e7bba2975c57ac2dc9
Signed-off-by: Konda Reddy Kachana <kkachana@google.com>