[CODEOWNERS] Add organization prefix to teams

Teams need to prefixed with the organization name to be assigned as
reviewers.

Signed-off-by: Michael Munday <mike.munday@lowrisc.org>
diff --git a/.github/CODEOWNERS b/.github/CODEOWNERS
index c216b6a..9d145d5 100644
--- a/.github/CODEOWNERS
+++ b/.github/CODEOWNERS
@@ -56,10 +56,10 @@
 # lint/             # TBD
 
 # SW related
-sw/**/*.c           @ot-c-cpp-reviewers
-sw/**/*.cc          @ot-c-cpp-reviewers
-sw/**/*.h           @ot-c-cpp-reviewers
-sw/**/*.rs          @ot-rust-reviewers
+sw/**/*.c           @lowRISC/ot-c-cpp-reviewers
+sw/**/*.cc          @lowRISC/ot-c-cpp-reviewers
+sw/**/*.h           @lowRISC/ot-c-cpp-reviewers
+sw/**/*.rs          @lowRISC/ot-rust-reviewers
 
 # Common docs
 /doc/               @asb