socfpga: Fix SOCFPGA build error for Altera dev kit

socfpga: Fix SOCFPGA build error for Altera dev kit

To fix the build error when build for Altera dev kit, not
virtual target. At same time, set the build for Altera dev
kit as default instead virtual target. With that, U-Boot
is booting well and SPL still lack of few drivers.

Signed-off-by: Chin Liang See <[email protected]>
Cc: Pavel Machek <[email protected]>
Cc: Marek Vasut <[email protected]>
Cc: Tom Rini <[email protected]>
Cc: Albert Aribaud <[email protected]>