Revert "linux: Inherit new machine_kernel_pr class"

This adds a new mandatory dependency on meta-openembedded layer. While we are
still trying to resolve an existing optional dependency, not bring a new one.
The MACHINE_KERNEL_PR requirement will need to be handled differently.

This reverts commit 1450f19380.

recipes-kernel/linux/linux-am335x-psp_3.2.bb

@@ -6,7 +6,7 @@ COMPATIBLE_MACHINE = "ti33x"
 
 DEFAULT_PREFERENCE = "-1"
 
-inherit kernel machine_kernel_pr
+inherit kernel
 require setup-defconfig.inc
 
 # Stage the power management firmware before building the kernel

recipes-kernel/linux/linux-ti-glsdk_3.8.bb

@@ -4,7 +4,7 @@ LICENSE = "GPLv2"
 LIC_FILES_CHKSUM = "file://COPYING;md5=d7810fab7487fb0aad327b76f1be7cd7"
 KERNEL_IMAGETYPE = "uImage"
 
-inherit kernel machine_kernel_pr
+inherit kernel
 
 require recipes-kernel/linux/linux-dtb.inc
 require recipes-kernel/linux/setup-defconfig.inc

recipes-kernel/linux/linux-ti-staging_3.8.bb

@@ -4,7 +4,7 @@ LICENSE = "GPLv2"
 LIC_FILES_CHKSUM = "file://COPYING;md5=d7810fab7487fb0aad327b76f1be7cd7"
 KERNEL_IMAGETYPE = "uImage"
 
-inherit kernel machine_kernel_pr
+inherit kernel
 
 require recipes-kernel/linux/linux-dtb.inc
 require recipes-kernel/linux/setup-defconfig.inc

recipes-kernel/linux/linux-ti-staging_git.bb

@@ -3,7 +3,7 @@ DESCRIPTION = "Linux kernel for TI devices"
 LICENSE = "GPLv2"
 LIC_FILES_CHKSUM = "file://COPYING;md5=d7810fab7487fb0aad327b76f1be7cd7"
 
-inherit kernel machine_kernel_pr
+inherit kernel
 
 require recipes-kernel/linux/linux-dtb.inc
 require recipes-kernel/linux/setup-defconfig.inc

recipes-kernel/linux/linux.inc

@@ -4,7 +4,7 @@ LICENSE = "GPLv2"
 
 LIC_FILES_CHKSUM = "file://COPYING;md5=d7810fab7487fb0aad327b76f1be7cd7"
 
-inherit kernel siteinfo machine_kernel_pr
+inherit kernel siteinfo
 
 # Enable OABI compat for people stuck with obsolete userspace
 ARM_KEEP_OABI ?= "1"