ARM: rpi: rename rpi_b to rpi

The U-Boot port runs on a variety of RPi models, not just the B. So,
rename the port to something slightly more generic.

Signed-off-by: Stephen Warren <swarren@wwwdotorg.org>
Reviewed-by: Simon Glass <sjg@chromium.org>
Tested-by: Simon Glass <sjg@chromium.org>
diff --git a/board/raspberrypi/rpi/Kconfig b/board/raspberrypi/rpi/Kconfig
new file mode 100644
index 0000000..6a538cf
--- /dev/null
+++ b/board/raspberrypi/rpi/Kconfig
@@ -0,0 +1,15 @@
+if TARGET_RPI
+
+config SYS_BOARD
+	default "rpi"
+
+config SYS_VENDOR
+	default "raspberrypi"
+
+config SYS_SOC
+	default "bcm2835"
+
+config SYS_CONFIG_NAME
+	default "rpi"
+
+endif