grpc: Update to 1.50.x release

License-update: Include MPL-2.0 [1]

Add missing BSD 3-clause and MPL-2.0 to license field

Switch to git submodules since its using locked versions of some
components like opencensus-proto

[1] https://github.com/grpc/grpc/commit/05fcd826f477ef1a024a2defa5e4b3d78f5e6eb4
Signed-off-by: Khem Raj <raj.khem@gmail.com>

meta-oe/recipes-devtools/grpc/grpc_1.50.0.bb

@@ -3,8 +3,8 @@ Provides gRPC libraries for multiple languages written on top of shared C core l
 (C++, Node.js, Python, Ruby, Objective-C, PHP, C#)"
 HOMEPAGE = "https://github.com/grpc/grpc"
 SECTION = "libs"
-LICENSE = "Apache-2.0"
-LIC_FILES_CHKSUM = "file://LICENSE;md5=6e4cf218112648d22420a84281b68b88"
+LICENSE = "Apache-2.0 & BSD-3-Clause & MPL-2.0"
+LIC_FILES_CHKSUM = "file://LICENSE;md5=731e401b36f8077ae0c134b59be5c906"
 
 DEPENDS = "c-ares protobuf protobuf-native protobuf-c protobuf-c-native openssl libnsl2 abseil-cpp re2"
 DEPENDS:append:class-target = " googletest grpc-native "
@@ -20,9 +20,9 @@ RDEPENDS:${PN}-dev:append:class-native = " ${PN}-compiler"
 # RDEPENDS:${PN}-dev += "${PN}-compiler"
 
 S = "${WORKDIR}/git"
-SRCREV_grpc = "b39ffcc425ea990a537f98ec6fe6a1dcb90470d7"
-BRANCH = "v1.45.x"
-SRC_URI = "git://github.com/grpc/grpc.git;protocol=https;name=grpc;branch=${BRANCH} \
+SRCREV_grpc = "91091e3668144de9c6aa392f496bb7639f7025a7"
+BRANCH = "v1.50.x"
+SRC_URI = "gitsm://github.com/grpc/grpc.git;protocol=https;name=grpc;branch=${BRANCH} \
            file://0001-Revert-Changed-GRPCPP_ABSEIL_SYNC-to-GPR_ABSEIL_SYNC.patch \
            file://0001-cmake-add-separate-export-for-plugin-targets.patch \
            file://0001-cmake-Link-with-libatomic-on-rv32-rv64.patch \