kernel: update guest kernel to 4.19.6 on aarch64

For supporting nvdimm, we need to update kernel on aarch64 to the
longterm version 4.19.6 and backport Suzuki K Poulose's latest
Dynamic IPA and 52bit IPA support patch series
(https://patchwork.kernel.org/cover/10616271/)which has been included
in 4.20-rc3+ to stable 4.19.6.

Fixes: #268

Signed-off-by: Penny Zheng <penny.zheng@arm.com>
Signed-off-by: Wei Chen <Wei.Chen@arm.com>

kernel/build-kernel.sh

@@ -179,14 +179,24 @@ setup_kernel() {
 
 	[ -d "${patches_path}" ] || die " patches path '${patches_path}' does not exist"
 
-	kernel_patches=$(find "${patches_path}" -name '*.patch' -type f)
+	kernel_patches=$(find "${patches_path}" -maxdepth 1 -name '*.patch' -type f)
 
 	pushd "${kernel_path}" >>/dev/null
 	for p in ${kernel_patches}; do
 		info "Applying patch $p"
 		patch -p1 <"$p"
 	done
 
+	patches_arch_path="${patches_path}/$(arch)"
+
+	if [ -d "${patches_arch_path}" ]; then
+		kernel_arch_patches=$(find "${patches_arch_path}" -name '*.patch' -type f)
+		for p in ${kernel_arch_patches}; do
+			info "Applying arch specific patch $p"
+			patch -p1 <"$p"
+		done
+	fi
+
 	[ -n "${hypervisor_target}" ] || hypervisor_target="kvm"
 	[ -n "${arch_target}" ] || arch_target="$(uname -m)"
 	arch_target=$(arch_to_kernel "${arch_target}")
@@ -282,7 +292,7 @@ main() {
 
 	# If not kernel version take it from versions.yaml
 	if [ -z "$kernel_version" ]; then
-		kernel_version=$(get_from_kata_deps "assets.kernel.version")
+		kernel_version=$(get_from_kata_deps "assets.kernel.architecture.$(arch).version")
 		#Remove extra 'v'
 		kernel_version="${kernel_version#v}"
 	fi