xtensa: clean up CONFIG_SYS_TEXT_ADDR

Drop CONFIG_SYS_MEMORY_TOP. Rename CONFIG_SYS_TEXT_ADDR to
XTENSA_SYS_TEXT_ADDR.

Signed-off-by: Max Filippov <jcmvbkbc@gmail.com>
diff --git a/arch/xtensa/cpu/u-boot.lds b/arch/xtensa/cpu/u-boot.lds
index 853ae5a..7200bc5 100644
--- a/arch/xtensa/cpu/u-boot.lds
+++ b/arch/xtensa/cpu/u-boot.lds
@@ -74,9 +74,9 @@
   SECTION_VECTOR(DoubleExceptionVector,text,XCHAL_DOUBLEEXC_VECTOR_VADDR,
 		 FOLLOWING(.DoubleExceptionVector.literal))
 
-  __monitor_start = CONFIG_SYS_TEXT_ADDR;
+  __monitor_start = XTENSA_SYS_TEXT_ADDR;
 
-  SECTION_text(CONFIG_SYS_TEXT_ADDR, FOLLOWING(.DoubleExceptionVector.text))
+  SECTION_text(XTENSA_SYS_TEXT_ADDR, FOLLOWING(.DoubleExceptionVector.text))
   SECTION_rodata(ALIGN(16), FOLLOWING(.text))
   SECTION_u_boot_list(ALIGN(16), FOLLOWING(.rodata))
   SECTION_data(ALIGN(16), FOLLOWING(.u_boot_list))