Fixup the wrong define

JDuchniewicz · JDuchniewicz · commit bbeb1f8957ea · 2025-11-17T16:36:59.000+11:00
Signed-off-by: Jakub Duchniewicz &lt;j.duchniewicz@unsw.edu.au&gt;
diff --git a/loader/src/uart.c b/loader/src/uart.c
@@ -169,7 +169,7 @@ void putc(uint8_t ch)
     while ((*UART_REG(ULSR) & ULSR_THRE) == 0);
     *UART_REG(UTHR) = ch;
 }
-#elif defined(BOARD_rock3b)
+#elif defined(CONFIG_PLAT_RK3568)
 #define UART_BASE   0xfe660000
 #define UTHR        0x0
 #define ULSR        0x14
