stx-kconfig.cfg: fix do_kernel_configcheck warnings

stx-kconfig.cfg: fix do_kernel_configcheck warnings

Fix the following warnings:

WARNING: linux-yocto-5.0.19+gitAUTOINC+7f6e97c357_55dd15336b-r0
do_kernel_configcheck: [kernel config]: specified values did not make it
into the kernel's final configuration:---------- CONFIG_CRC_CCITT

Requested value:  CONFIG_CRC_CCITT=m
Actual value:     CONFIG_CRC_CCITT=y

do_kernel_configcheck: [kernel config]: This BSP sets config options
that are not offered anywhere within this kernel:
CONFIG_IOSCHED_CFQ
CONFIG_CFQ_GROUP_IOSCHED

Issue-ID: INF-36
Signed-off-by: Jackie Huang <jackie.huang@windriver.com>
Change-Id: I9237b55ece178f795152d0d71076c7ec2a703f56