Typo fix

Author: cleveHEX

boards.txt

@@ -1664,12 +1664,7 @@ alksesp32.build.flash_freq=40m
 alksesp32.build.flash_mode=dio
 alksesp32.build.boot=dio
 alksesp32.build.partitions=default
-esp32.build.defines=
-
-alksesp32.menu.PSRAM.disabled=Disabled
-alksesp32.menu.PSRAM.disabled.build.defines=
-alksesp32.menu.PSRAM.enabled=Enabled
-alksesp32.menu.PSRAM.enabled.build.defines=-DBOARD_HAS_PSRAM -mfix-esp32-psram-cache-issue
+alksesp32.build.defines=
 
 alksesp32.menu.PartitionScheme.default=Default
 alksesp32.menu.PartitionScheme.default.build.partitions=default