kernel: Default to no gcc on kernel 6.x

Current logic defaults to no gcc if kernel major version is greater than
or equal to 5 and kernel minor version is greater than or equal to 10.
Meaning kernel version 6.1 does not qualify because 1 is less than 10.
So additionally check if kernel major version is greater than or equal
to 6 and ignore minor version for that case.

Change-Id: Id72cb9e100c6fed014d696f4a3a88f6cafcd3932