[coreboot] [PATCH] Bayou: clear screen after returning from payload

[Ulf Jordan]

Hello!

The tinycurses damage detection introduced in libpayload r3579 lead to 
Bayou not properly redrawing its screen after returning from payloads. The 
attached patch solves the problem by clearing stdscr directly after 
returning to Bayou.

Compile and runtime tested with libpayload and coreboot-v3 under QEMU.

/ulf