serial: mvebu-uart: uart2 error bits clearing

For mvebu uart2, error bits are not cleared on buffer read.
This causes interrupt loop and system hang.

Cc: [email protected]
Reviewed-by: Yi Guo <[email protected]>
Reviewed-by: Nadav Haklai <[email protected]>
Signed-off-by: Narendra Hadke <[email protected]>
Signed-off-by: Pali Rohár <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Greg Kroah-Hartman <[email protected]>

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