MAINTAINERS: Add git tree for NVMEM FRAMEWORK

There is no git tree for NVMEM FRAMEWORK in MAINTAINERS, it is not
convinent to rebase, add it.
Signed-off-by: NTiezhu Yang <yangtiezhu@loongson.cn>
Signed-off-by: NSrinivas Kandagatla <srinivas.kandagatla@linaro.org>
Link: https://lore.kernel.org/r/20200722100705.7772-3-srinivas.kandagatla@linaro.orgSigned-off-by: NGreg Kroah-Hartman <gregkh@linuxfoundation.org>

MAINTAINERS

@@ -12266,6 +12266,7 @@ F:	drivers/nvme/target/
 NVMEM FRAMEWORK
 M:	Srinivas Kandagatla <srinivas.kandagatla@linaro.org>
 S:	Maintained
+T:	git git://git.kernel.org/pub/scm/linux/kernel/git/srini/nvmem.git
 F:	Documentation/ABI/stable/sysfs-bus-nvmem
 F:	Documentation/devicetree/bindings/nvmem/
 F:	drivers/nvmem/