crypto/fsl: fix obj-yy in Makefile

When enabling CONFIG_CMD_BLOB and/or CONFIG_CMD_DEKBLOB, the build fails
with a linker error:
  ...
  LD      u-boot
arch/arm/mach-imx/built-in.o: In function `blob_encap_dek':
/home/clemens/dev/u-boot/arch/arm/mach-imx/cmd_dek.c:46: undefined
reference to `blob_dek'

This is due to an error in the Makefile, resulting in obj-yy/obj-yn/..
and fsl_blob.o is therefore not linked.

Fix it by splitting it up into two obj-y lines.
Signed-off-by: NClemens Gruber <clemens.gruber@pqgruber.com>
Reviewed-by: NFabio Estevam <fabio.estevam@nxp.com>

drivers/crypto/fsl/Makefile

@@ -6,5 +6,6 @@
 
 obj-y += sec.o
 obj-$(CONFIG_FSL_CAAM) += jr.o fsl_hash.o jobdesc.o error.o
-obj-$(CONFIG_CMD_BLOB)$(CONFIG_CMD_DEKBLOB) += fsl_blob.o
+obj-$(CONFIG_CMD_BLOB) += fsl_blob.o
+obj-$(CONFIG_CMD_DEKBLOB) += fsl_blob.o
 obj-$(CONFIG_RSA_FREESCALE_EXP) += fsl_rsa.o