smartweb: use SPL_TINY_MEMSET

The SPL code for smartweb is close to its limit and adding a few extra
instructions to SPL will cause it to overrun its sram allotement (thus
causing build failures).  To allow adding the 'spl_perform_fixups'
extension point to SPL, we'll enable SPL_TINY_MEMSET for smartweb.

Signed-off-by: Philipp Tomsich <philipp.tomsich@theobroma-systems.com>
Series-cc: trini
diff --git a/configs/smartweb_defconfig b/configs/smartweb_defconfig
index 1f246e3..9ae30a1 100644
--- a/configs/smartweb_defconfig
+++ b/configs/smartweb_defconfig
@@ -54,4 +54,5 @@
 CONFIG_USB_HOST_ETHER=y
 CONFIG_USB_ETHER_ASIX=y
 CONFIG_USB_ETHER_MCS7830=y
+CONFIG_SPL_TINY_MEMSET=y
 # CONFIG_EFI_LOADER is not set