crypto: inside-secure - fix a typo in a register name

This patch fixes a typo in the EIP197_HIA_xDR_WR_CTRL_BUG register name,
as it should be EIP197_HIA_xDR_WR_CTRL_BUF. This is a cosmetic only
change.

Signed-off-by: Antoine Tenart <antoine.tenart@bootlin.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>