xilinx: Introduce XILINX_MINI configuration

There is no common symbol which mini configurations are using and recent
get_mem_top() changes adding 1.3kB without having a way to remove it.
That's why introduce new symbol which can be used for removing features
which are not requested by these configurations.

Signed-off-by: Michal Simek <michal.simek@amd.com>
Link: https://lore.kernel.org/r/aa27b72e17057fa8cbdd92a2bbb863a31c8c1226.1731681053.git.michal.simek@amd.com
diff --git a/configs/xilinx_versal_mini_qspi_defconfig b/configs/xilinx_versal_mini_qspi_defconfig
index ef6eec0..4d23b35 100644
--- a/configs/xilinx_versal_mini_qspi_defconfig
+++ b/configs/xilinx_versal_mini_qspi_defconfig
@@ -11,6 +11,7 @@
 CONFIG_ENV_SIZE=0x80
 CONFIG_DEFAULT_DEVICE_TREE="versal-mini-qspi-single"
 CONFIG_SYS_LOAD_ADDR=0x8000000
+CONFIG_XILINX_MINI=y
 CONFIG_SYS_MEM_RSVD_FOR_MMU=y
 CONFIG_VERSAL_NO_DDR=y
 # CONFIG_PSCI_RESET is not set