w64: Change data type of parameters for flush_icache_range

w64: Change data type of parameters for flush_icache_range

The TCG targets i386 and tci needed a change of the function
prototype for w64.

This change is currently not needed for the other TCG targets,
but it can be applied to avoid code differences.

Cc: Blue Swirl <[email protected]>
Cc: Andrzej Zaborowski <[email protected]>
Cc: Richard Henderson <[email protected]>
Cc: Aurelien Jarno <[email protected]>
Cc: Alexander Graf <[email protected]>
Signed-off-by: Stefan Weil <[email protected]>
Signed-off-by: Blue Swirl <[email protected]>