kernel.bbclass: Create modules directory even if there is no modules installed
During kernel_do_install it needs to make symbol link at
${D}/lib/modules/${KERNEL_VERSION}/build, but there will not be
${D}/lib/modules/${KERNEL_VERSION} if there is no modules installed for current
image, which will result in a build failure.
Add "mkdir -p ${D}/lib/modules/${KERNEL_VERSION}" here to avoid this failure
and the need of similar changes in other scripts that also expect it to exist.
Signed-off-by: He Zhe <zhe.he@windriver.com> Signed-off-by: Ross Burton <ross.burton@intel.com>
