configs/snps_archs38_hsdk: re-enable USB support

With this patch we enable CONFIG_USB for HSDK, which is not explicitly
selected by UDL since the commit 5d50bd440bc2 ("drm/udl: Make udl
driver depend on CONFIG_USB"). Commit 4c13ca86dcf8 ("ARC:
[plat-hsdk]: fix USB regression") is not yet backported to Linux
kernel 5.6.x, so we enable this option in fragment file for HSDK.

Signed-off-by: Evgeniy Didin <Evgeniy.Didin@synopsys.com>
Cc: Thomas Petazzoni <thomas.petazzoni@bootlin.com>
Cc: Eugeniy Paltsev <Eugeniy.Paltsev@synopsys.com>
Cc: arc-buildroot@synopsys.com
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@bootlin.com>