Convert CONFIG_SYS_BOOTM_LEN to Kconfig

This converts the following to Kconfig:
   CONFIG_SYS_BOOTM_LEN

As part of this, rework error handling in boot/bootm.c so that we pass
the buffer size to handle_decomp_error as CONFIG_SYS_BOOTM_LEN will not
be available to host tools but we do know the size that we passed to
malloc().

Cc: Soeren Moch <smoch@web.de>
Signed-off-by: Tom Rini <trini@konsulko.com>
diff --git a/configs/ls1021atsn_qspi_defconfig b/configs/ls1021atsn_qspi_defconfig
index b368791..4ee3072 100644
--- a/configs/ls1021atsn_qspi_defconfig
+++ b/configs/ls1021atsn_qspi_defconfig
@@ -29,6 +29,7 @@
 CONFIG_ID_EEPROM=y
 CONFIG_SYS_CBSIZE=256
 CONFIG_SYS_PBSIZE=276
+CONFIG_SYS_BOOTM_LEN=0x8000000
 CONFIG_CMD_GREPENV=y
 CONFIG_SYS_I2C_EEPROM_ADDR_LEN=2
 CONFIG_CMD_MEMINFO=y