disk: part: avoid undefined reference to `__udivmoddi4'
When compiling with FTRACE=1 an error
ld.bfd: disk/built-in.o: in function `lba512_muldiv':
disk/part.c:114: undefined reference to `__udivmoddi4
occurred.
Use '>> 11' instead of '/ 2048' to avoid the division.
Signed-off-by: NHeinrich Schuchardt <xypron.glpk@gmx.de>
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