arm64: defconfig: Disable hvc console for lahaina SoC

hvc based console is not required as uart based serial
console support is enabled for lahiana SoC.

Change-Id: I97da5df3dc18f3c938c28ca22c7209de7d1d10cb
Signed-off-by: Prasad Sodagudi <psodagud@codeaurora.org>