blackfin: defconfigs: cleanup unused CONFIG_MTD_CHAR, add MTD_SPI_NOR for BF537-STAMP

Signed-off-by: Steven Miao <realmz6@gmail.com>

diff --cc arch/blackfin/configs/BF518F-EZBRD_defconfig
Simple merge

diff --cc arch/blackfin/configs/BF527-TLL6527M_defconfig
Simple merge

diff --cc arch/blackfin/configs/BF533-EZKIT_defconfig
Simple merge

diff --cc arch/blackfin/configs/BF533-STAMP_defconfig
Simple merge

diff --cc arch/blackfin/configs/BF537-STAMP_defconfig
Simple merge

diff --cc arch/blackfin/configs/BF538-EZKIT_defconfig
Simple merge

diff --cc arch/blackfin/configs/BF561-ACVILON_defconfig
Simple merge

diff --cc arch/blackfin/configs/BF561-EZKIT-SMP_defconfig
Simple merge

diff --cc arch/blackfin/configs/BF561-EZKIT_defconfig
Simple merge

diff --cc arch/blackfin/configs/CM-BF527_defconfig
Simple merge

diff --cc arch/blackfin/configs/CM-BF533_defconfig
Simple merge

diff --cc arch/blackfin/configs/CM-BF537E_defconfig
Simple merge

diff --cc arch/blackfin/configs/CM-BF537U_defconfig
Simple merge

diff --cc arch/blackfin/configs/CM-BF548_defconfig
Simple merge

diff --cc arch/blackfin/configs/CM-BF561_defconfig
Simple merge

diff --cc arch/blackfin/configs/DNP5370_defconfig
Simple merge

diff --cc arch/blackfin/configs/IP0X_defconfig
Simple merge

diff --cc arch/blackfin/configs/PNAV-10_defconfig
Simple merge

diff --cc arch/blackfin/configs/SRV1_defconfig
Simple merge

diff --cc arch/blackfin/configs/TCM-BF518_defconfig
Simple merge

diff --cc arch/blackfin/configs/TCM-BF537_defconfig
Simple merge