Change in coreboot[master]: soc/mediatek: Fix function type and initialize structure to zero

[Yu-Ping Wu (Code Review)]

Attention is currently required from: Hung-Te Lin, Paul Menzel, Jianjun Wang, Felix Held.
Yu-Ping Wu has posted comments on this change. ( https://review.coreboot.org/c/coreboot/+/63190 )

Change subject: soc/mediatek: Fix function type and initialize structure to zero
......................................................................

Patch Set 1:

(4 comments)

Commit Message:

https://review.coreboot.org/c/coreboot/+/63190/comment/c6c99fd6_d96ef2d2 
PS1, Line 7: soc/mediatek: Fix function type and initialize structure to zero
soc/mediatek/early_init: Fix function return type

https://review.coreboot.org/c/coreboot/+/63190/comment/559807ca_8174aa6d 
PS1, Line 9: function type
return type of early_init_get_elapsed_time_us()

https://review.coreboot.org/c/coreboot/+/63190/comment/438672b9_4b22a867 
PS1, Line 9: , and
           : initialize structure to zero to replace memset.
Move to a separate paragraph.

Also replace memset() with struct initializer.

File src/soc/mediatek/common/early_init.c:

https://review.coreboot.org/c/coreboot/+/63190/comment/a85e6ee9_ed494624 
PS1, Line 34: early_init_get_elapsed_time_us
What about the caller of this (perst_time_us and min_perst_time_us in soc/mediatek/common/pcie.c)?