kernel_legacyhs: Adapt to recent changes in oe-core

Three recent changes in oe-core [1], [2] and [3] have moved around
various things with the kernel classes.  Since we have our own copy
of the old kernel class we need to adapt to the changes.

[1] https://git.openembedded.org/openembedded-core/commit/?id=945f3faa4909b226996eff62bf55fa586a5279fa
[2] https://git.openembedded.org/openembedded-core/commit/?id=635f85b7b8ffe4bfd5f282a98bdf640aa037cde1
[3] https://git.openembedded.org/openembedded-core/commit/?id=06057ac24f74ce5de74dfc7b479a1e2c796bcdcd

Signed-off-by: Ryan Eatmon <reatmon@ti.com>

meta-ti-bsp/classes/kernel_legacyhs.bbclass

@@ -4,7 +4,9 @@
 # SPDX-License-Identifier: MIT
 #
 
-inherit linux-kernel-base kernel-module-split
+inherit kernel-arch kernel-module-split
+
+export ARCH = "${@oe.kernel.map_kernel_arch(d)}"
 
 COMPATIBLE_HOST = ".*-linux"
 
@@ -227,7 +229,7 @@ KERNEL_DTBVENDORED ?= "0"
 #
 # configuration
 #
-KERNEL_VERSION = "${@get_kernelversion_headers('${B}')}"
+KERNEL_VERSION = "${@oe.kernel.get_version_headers('${B}')}"
 
 # kernels are generally machine specific
 PACKAGE_ARCH = "${MACHINE_ARCH}"
@@ -660,7 +662,7 @@ KERNEL_LOCALVERSION ??= ""
 #
 # Note: This class saves the value of localversion to a file
 # so other recipes like make-mod-scripts can restore it via the
-# helper function get_kernellocalversion_file
+# helper function oe.kernel.get_localversion_file
 export LOCALVERSION = "${KERNEL_LOCALVERSION}"
 
 kernel_legacyhs_do_configure() {