[POWERPC] Uartlite: Flush RX fifo in bootwrapper
Flush the uartlite RX fifo so that characters typed before entry into the zImage wrapper do not muck up the kernel command line. Signed-off-by: NGrant Likely <grant.likely@secretlab.ca> Signed-off-by: NJosh Boyer <jwboyer@linux.vnet.ibm.com>
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