ARM: debug: Update MSM and QCOM DEBUG_LL help

Add another SoC address for apq8064 and use DEBUG_UART_VIRT
instead of DEBUG_UART_BASE because the former actually exists.

Signed-off-by: Stephen Boyd <sboyd@codeaurora.org>
Signed-off-by: Kumar Gala <galak@codeaurora.org>