Change in coreboot[master]: amdfwtool: Change the definition of level to a bitwise form

[Felix Held (Code Review)]

Attention is currently required from: Bao Zheng, Martin Roth, Marshall Dawson, Zheng Bao.
Felix Held has posted comments on this change. ( https://review.coreboot.org/c/coreboot/+/58765 )

Change subject: amdfwtool: Change the definition of level to a bitwise form
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Patch Set 2: Code-Review+1

(1 comment)

File util/amdfwtool/amdfwtool.h:

https://review.coreboot.org/c/coreboot/+/58765/comment/256d476f_56ab7bbf 
PS2, Line 186: #define BDT_LVL1 0x1
for consistency it might be good to write this as (0x1 << 0). same below. i'd also drop the 0x prefix and just use (1 << 0) and (1 << 1)