board: dragonboard410c: Enable support for KASLR in Linux

board: dragonboard410c: Enable support for KASLR in Linux

When booting Linux, there is currently the following warning in the console
when using the default dragonboard410c_defconfig:

  [    0.000000] KASLR disabled due to lack of seed

Fix this by enabling DM_RNG and RNG_MSM in the defconfig to generate the
KASLR seed:

  [    0.000000] KASLR enabled

Signed-off-by: Stephan Gerhold <stephan.gerhold@linaro.org>
Reviewed-by:
Reviewed-by: Sumit Garg <sumit.garg@oss.qualcomm.com>
Link: https://lore.kernel.org/r/20250417-db410c-fixes2-v1-3-76ad994da152@linaro.org
Signed-off-by: Casey Connolly <casey.connolly@linaro.org>