app/testpmd: fix build with bypass without ixgbe

app/testpmd: fix build with bypass without ixgbe

When ixgbe bypass is not explicitly disabled while ixgbe is disabled:
app/test-pmd/testpmd.c:304:27: error:
	‘RTE_PMD_IXGBE_BYPASS_TMT_OFF’ undeclared here

The ixgbe bypass feature is meaningful only if ixgbe is enabled.
So we need to check both.

A best fix will be to enable bypass always and remove this option.

Fixes: e261265e42a1 ("ethdev: move bypass functions to ixgbe PMD")
Signed-off-by: Thomas Monjalon <thomas@monjalon.net>