configs/sheevaplug_defconfig: bump Linux to fix binutils 2.41 build

Fixes:
https://gitlab.com/buildroot.org/buildroot/-/jobs/6761770801

The Linux kernel fails to build since commit e88225ed882 (package/binutils:
make 2.41 the default version):

arch/arm/mm/proc-feroceon.S: Assembler messages:
arch/arm/mm/proc-feroceon.S:587: Error: junk at end of line, first unrecognized character is `#'
make[3]: *** [scripts/Makefile.build:430: arch/arm/mm/proc-feroceon.o] Error 1
make[3]: *** Waiting for unfinished jobs....

Fix the build by bumping the kernel to 4.14.336, which includes commit
3ab03df64f77 (ARM: 8933/1: replace Sun/Solaris style flag on section
directive):

https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/commit/?h=linux-4.14.y&id=3ab03df64f7754728a2257c47775a70a88428331

Signed-off-by: Peter Korsgaard <peter@korsgaard.com>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@bootlin.com>

configs/sheevaplug_defconfig

@@ -27,7 +27,7 @@ BR2_TARGET_UBOOT_FORMAT_KWB=y
 # Kernel
 BR2_LINUX_KERNEL=y
 BR2_LINUX_KERNEL_CUSTOM_VERSION=y
-BR2_LINUX_KERNEL_CUSTOM_VERSION_VALUE="4.14.253"
+BR2_LINUX_KERNEL_CUSTOM_VERSION_VALUE="4.14.336"
 BR2_LINUX_KERNEL_DEFCONFIG="mvebu_v5"
 BR2_LINUX_KERNEL_APPENDED_UIMAGE=y
 BR2_LINUX_KERNEL_UIMAGE_LOADADDR="0x8000"