BACKPORT: rpmsg: Fix kfree() of static memory on setting driver_override

commit 42cd402b8fd4672b692400fe5f9eecd55d2794ac upstream.

The driver_override field from platform driver should not be initialized
from static memory (string literal) because the core later kfree() it,
for example when driver_override is set via sysfs.

Use dedicated helper to set driver_override properly.

Bug: 295334746
Fixes: 950a7388f02b ("rpmsg: Turn name service into a stand alone driver")
Fixes: c0cdc19f ("rpmsg: Driver for user space endpoint interface")
Reviewed-by: Bjorn Andersson <bjorn.andersson@linaro.org>
Signed-off-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Link: https://lore.kernel.org/r/20220419113435.246203-13-krzysztof.kozlowski@linaro.org


Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Lee Jones <lee@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
(cherry picked from commit 2e76b4f6218c4db3ff00eb15d94d72f371736de4)
[Lee: Cater for name change s/rpmsg_chrdev/rpmsg_ctrl/ due to previous backport]
Signed-off-by: Lee Jones <joneslee@google.com>
Change-Id: Ib900ad13efcfdf7e50fb92bb45dff2b8aa8ff443