ramips: mtk_eth_soc: wait longer after FE core reset to settle

Enabling the FE core too early causes the system to hang during boot
uncondtionally, after the reset is released. Increate it to 1-1.2ms
range.

Fixes: 60fadae6 ("ramips: ethernet: ralink: move reset of the esw into the esw instead of fe")
Signed-off-by: Maxim Anisimov <maxim.anisimov.ua@gmail.com>

[Split previous commit, provide rationale]
Signed-off-by: Lech Perczak <lech.perczak@gmail.com>

(cherry picked from commit 7eb0458c1f7e4f681b16d2721cfc3fcb69774c95)
Signed-off-by: Lech Perczak <lech.perczak@gmail.com>