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This fixes the timing when flashing over a serial console.

Corresponding to flashrom svn r46 and coreboot v2 svn r2204.

Corresponding to flashrom svn r34 and coreboot v2 svn r2111.

Corresponding to flashrom svn r15 and coreboot v2 svn r1457.

Corresponding to coreboot v1 svn r893.

Corresponding to coreboot v1 svn r888.

Corresponding to coreboot v1 svn r873.

Corresponding to coreboot v1 svn r752.

 - switch to volatile everywhere
 - use myusec_delay instead of usleep

Corresponding to coreboot v1 svn r492.

Corresponding to coreboot v1 svn r489.