lpc32xx: Kconfig: switch to CONFIG_CONS_INDEX

There's nothing special or unique to the lpc32xx that requires its own config
parameter for specifying the console uart index. Therefore instead of using
the lpc32xx-specific CONFIG_SYS_LPC32XX_UART include parameter, use the
already-available CONFIG_CONS_INDEX from Kconfig.

Signed-off-by: Trevor Woerner <twoerner@gmail.com>
Reviewed-by: Simon Glass <sjg@chromium.org>
diff --git a/configs/work_92105_defconfig b/configs/work_92105_defconfig
index c3f666d..e9605ad 100644
--- a/configs/work_92105_defconfig
+++ b/configs/work_92105_defconfig
@@ -48,5 +48,7 @@
 CONFIG_PHYLIB=y
 CONFIG_PHY_ADDR_ENABLE=y
 CONFIG_PHY_SMSC=y
+CONFIG_SPECIFY_CONSOLE_INDEX=y
+CONFIG_CONS_INDEX=5
 CONFIG_SYS_NS16550=y
 CONFIG_SPI=y