linux-yocto_4.1: use BSP_SUBTYPE for BSP specific configuration

Leaf Hill BSP has specific kernel configuration in yocto-kernel-cache
for kernel v4.1. We found some issue where we can't overwrite the
existing kernel configs in yocto-kernel-cache from developer's
custom meta layer.

Root cause analysis has shown that the usage of KERNEL_FEATURES
in kernel recipes and local.conf to pick up BSP specific configs
from kernel-meta is inappropriate. KERNEL_FEATURES should
always and only used for adding configuration or features to the build.
A new variable "BSP_SUBTYPE" has been created to resolve this issue.

Suggested-by: Bruce Ashfield <bruce.ashfield@windriver.com>
Signed-off-by: Rebecca Chang Swee Fun <rebecca.swee.fun.chang@intel.com>
Signed-off-by: Saul Wold <sgw@linux.intel.com>

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