lib/cmsis-svd: switch to new location and latest version of shared SVD repository

Signed-off-by: deadprogram <ron@hybridgroup.com>

.gitmodules

@@ -9,7 +9,8 @@
 	url = https://github.com/avr-rust/avr-mcu.git
 [submodule "lib/cmsis-svd"]
 	path = lib/cmsis-svd
-	url = https://github.com/tinygo-org/cmsis-svd
+	url = https://github.com/cmsis-svd/cmsis-svd.git
+	branch = main
 [submodule "lib/wasi-libc"]
 	path = lib/wasi-libc
 	url = https://github.com/WebAssembly/wasi-libc

lib/cmsis-svd

@@ -1 +1 @@
-Subproject commit df75ff974c76a911fc2815e29807f5ecaae06fc2
+Subproject commit 4decfa8e40a0ba2d1f65f551886af74dbf67a46e