Fix URLs to old freescale git repos

Freescale git repos are now on source.codeaurora.org.

Signed-off-by: Pali Rohár <pali@kernel.org>
diff --git a/doc/README.mpc85xx-sd-spi-boot b/doc/README.mpc85xx-sd-spi-boot
index e3f5804..329de4e 100644
--- a/doc/README.mpc85xx-sd-spi-boot
+++ b/doc/README.mpc85xx-sd-spi-boot
@@ -14,7 +14,7 @@
 ========================
 
 you can browse it online at:
-http://git.freescale.com/git/cgit.cgi/ppc/sdk/boot-format.git/
+https://source.codeaurora.org/external/qoriq/qoriq-yocto-sdk/boot-format
 
 Building
 ========