ASoC: wcd9306: Fixup the DAPM routing as per codec capabilities

Add mixer controls to enable sharing the same RX path between headphones
and lineout.

CRs-fixed: 536156, 545348
Change-Id: Ie62e5b8a92935a7dc25a9385ba816b6862977071
Signed-off-by: Bhalchandra Gajare <gajare@codeaurora.org>