soc/qcom: early_random: Fix race during early random pool initialization

Recent random.c upstream introduced early random pool init race.
As Jason A. Donenfeld suggests, change the call to
add_hwgenerator_randomness to be add_bootloader_randomness,
and remove the last argument with the left shift operator usage.

This fixes the splash boot issue after latest RNG upstream and adapts
Qualcomm's early random driver to it.

Test: Device boots, RNG probes successfully alongside early_random driver.

Change-Id: Id75c66bf6d65bf077570a68145d4a4d200747865
Suggested-by: Jason A. Donenfeld <Jason@zx2c4.com>
Co-authored-by: Jason A. Donenfeld <Jason@zx2c4.com>
Signed-off-by: Reinazhard <reinazhard@gmail.com>
[ Tashar02: Reword the commit message & description ]
Signed-off-by: Tashfin Shakeer Rhythm <tashfinshakeerrhythm@gmail.com>
(cherry picked from commit bd8265f32a21efc95d9b2d7473ca30e17352b0eb)
Signed-off-by: Albert I <kras@raphielgang.org>