drivers: nand: brcmnand: add initial support

The driver brcmnand come from linux kernel 4.18.
Only SoC bcm6838 and bcm6858 are supported.

Signed-off-by: Philippe Reynes <philippe.reynes@softathome.com>
diff --git a/drivers/mtd/nand/raw/Makefile b/drivers/mtd/nand/raw/Makefile
index b10e718..9337f64 100644
--- a/drivers/mtd/nand/raw/Makefile
+++ b/drivers/mtd/nand/raw/Makefile
@@ -41,6 +41,7 @@
 
 obj-$(CONFIG_NAND_ATMEL) += atmel_nand.o
 obj-$(CONFIG_NAND_ARASAN) += arasan_nfc.o
+obj-$(CONFIG_NAND_BRCMNAND) += brcmnand/
 obj-$(CONFIG_NAND_DAVINCI) += davinci_nand.o
 obj-$(CONFIG_NAND_DENALI) += denali.o
 obj-$(CONFIG_NAND_DENALI_DT) += denali_dt.o