build error in current git

[Anca Emanuel]

  CC [M]  drivers/usb/serial/qcaux.o
drivers/video/mb862xx/mb862xx-i2c.c: In function ‘mb862xx_i2c_wait_event’:
drivers/video/mb862xx/mb862xx-i2c.c:25:3: error: implicit declaration
of function ‘udelay’
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